var uploadParams;
function openUploadPage(url, params, width, height) {
	uploadParams = params;
	url = url + "?lang=" + params["lang"];	
	
	if(width == null) {
		width = 520;
	}
	
	if(height == null) {
		height = 290;
	}
	
	var x = (screen.width - width) / 2;
	var y = (screen.height - height) / 2;
	var page = window.open(url, "upload", "dependent=no, location=no, menubar=no, scrollbars=no, status=no, titlebar=no, toolbar=no, directories=no, left="+x+", top="+y+", width="+width+", height="+height+"", false);
	page.focus();
}